i88 



AMIANTIS. 



and strong lateral ones. The common length of the 

 shell is two or three inches, but sometimes it is much 

 more. It is found on the southern coast. 



Fig. i6o. 



Standella 7iasiita^ Conr., na-su^-ta. Very similar 

 to the next species, of which it is perhaps only a vari- 

 ety; shell somewhat depressed behind the beaks. 

 An inch or more in length. 



Sta7idella planulata^ Conr. , plan-u-la'-ta, is shown 

 in Fig. i6i. 



Its shape is much like 

 that of the last, but it is 

 only half as long. The 

 beaks are nearly equidis- 

 tant from the ends of the 

 shell, and the triangular 

 hinge-tooth is in front of 

 Its color is white; found in southern 

 waters. 



Standella falcata, Gld., fal-ka"-ta. Shaped like 

 Fig. i6i, but smaller and flatter. Glossy; less than 

 an inch long; northern. 



Fig. i6i 



the ligament. 



